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    Command:

    sched_yield

    
    
    

    SYNOPSIS

           #include <sched.h>
    
           int sched_yield(void);
    
    
    

    DESCRIPTION

           sched_yield()  causes  the  calling  thread to relinquish the CPU.  The
           thread is moved to the end of the queue for its static priority  and  a
           new thread gets to run.
    
    
    

    RETURN VALUE

           On  success,  sched_yield()  returns  0.  On error, -1 is returned, and
           errno is set appropriately.
    
    
    

    ERRORS

           In the Linux implementation, sched_yield() always succeeds.
    
    
    

    CONFORMING TO

           POSIX.1-2001.
    
    
    

    NOTES

           If the calling thread is the only thread in the highest  priority  list
           at that time, it will continue to run after a call to sched_yield().
    
           POSIX  systems on which sched_yield() is available define _POSIX_PRIOR-
           ITY_SCHEDULING in <unistd.h>.
    
           Strategic calls to sched_yield()  can  improve  performance  by  giving
           other  threads  or  processes  a chance to run when (heavily) contended
           resources (e.g., mutexes) have been  released  by  the  caller.   Avoid
           calling  sched_yield()  unnecessarily  or  inappropriately  (e.g., when
           resources needed by other schedulable threads are  still  held  by  the
           caller),  since  doing  so will result in unnecessary context switches,
           which will degrade system performance.
    
    
    

    SEE ALSO

           sched_setscheduler(2) for a description of Linux scheduling
    
           Programming for the real  world  -  POSIX.4  by  Bill  O.  Gallmeister,
           O'Reilly & Associates, Inc., ISBN 1-56592-074-0.
    
    
    

    Linux 2008-10-18 SCHED_YIELD(2)

    
    
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